Brake shoe



Patented July 12, 1932 entree stares:

lJLAURIGE N. TRAINER, on nest ORANGE, NEW annsninssieivoiz 'ro THE "n'mnnioaiv BRAKE SHOE'AND FOUND-RY COMPANY; orwrmvrmeron, DELAWARE, A conronn- 3 TION OF DELAWARE BRAKE Application filed May 31;

strengthen the shoe and to enable the shoe to be continued in use and give efficient service even though cast iron parts may be fractured.

A car shoe having a cast iron body with or; without inserts in the face thereof and with a ductile metal reenforce back embedded therein will fracture through the body inv service but the parts will be held together by the metal back until it breaks so that the shoe may be continued in use and give efficient service. The fracture in the body ordinarily occurs transversely and at one side of theattaching lug. Since the life of a freight car shoe averages four to five years and during service is subjected to a variety of stresses and strains, vibrations and pressures, it can-, not be determined with any degree of certainty whether or not the back will break before the body is worn down to the limit of wear.

hoes have been found with the body and the back broken after very little wear and even when the shoe is practically new, and then again shoes have been taken ofi the heads worn down to and even below the limit of wear with thebody fractured but the back still in serviceable condition. It is found, however, that the fracture usually occurs in the body at one or the other side of the attaching lug and close thereto, and my invention has for its object to reenforce and strengthen the back in particular and the shoe generally at the middle portion of the back to withstand the forces which tend to break the back after the body is fractured at or about midway between its ends.

And another object is to anchor the attaching lug strap securely to the back of the shoe to prevent it from being torn loose from the shoe body in service and permitting the body to fall away from the head. 7 I

I have illustrated the invention in a common cast iron car shoe having a steel reenforce back and referring thereto,

Fig. 1 is a plan view of the back and lug strap with the cast iron body shown in broken lines.

snon

1930. Serial No. 457,794. 7

Fig. 2 is longitudinal sectional view of the shoe on the line 22fof Fig. 1.

Fig. Sis a perspective view of the lug strap.

Fig. 4 is atransverse sectional view on the line 4. 4 of Fig. 2.

F 5 is a detail sectional view through 5; the back and lug strap on the line .5-5 f which is embedded in the body at the back thereof during the casting operation. The

lug strap 9 has legs 10 and elongated wings 11 and the side edges of the reenforce back are cut out at 12 to receive the legs 10, the wings'll being located beneath the back and extend longitudinally thereof. These wings overlap the middle portion of the shoe body at or about which fracture is most likely to occur. The back is embedded securely and rigidly in the body during the casting operation and it is most likely to break opposite the fracture in the body. The cut-outs in the side If.

edges of the back reduce the strength of the back to resist stresses, strains and vibrations to which the back is subjected in service after the body is fractured. The wings provide sulficient reenforcement for the back at that part which is weakened by the cut-outs and where the stresses, strains and vibrations will most seriously affect the back after the body is fractured, to overcome these weaknesses in the back and enable the shoe. to continue in efficient service until it is worn out.

The body metal is run up at 12 at the sides of the legs of the lug strap to form with the strap the attaching lug of the shoe. The

wings are welded at 13 tothe back. The

elongated wings welded to the underside of the back securely anchor the lug strap to the back and through the back to the body of the shoe. The projections 12, 12 not only protect the lug strap against distortion in shipping and in service but they also reenforce and strengthen the strap to provide a strong and substantial attaching lug. Sometimes the projections 12, 12 are fractured and dislodged from the shoe and in such case the lug strap may be disengaged from theshoe. The elongated wings 11, 11 provide'a secure anchorage for the lug strap in the shoe beneath the back so that it will not be disengaged even though the projections 12, 12 are broken away. The. lug strap is preferably made from a single sheet of metal bent to shape and in the complete shoe those parts of the wings which project beyond the strap 9 will interlock. with the back and with the "body to secure the strap in place withor without the projections 12,12. V

I have shown the invention embodied in a common cast iron car shoe but it is adaptable for shoes of other types and I reserve the right to make any changes necessary or desirable in adapting the invention to brake shoesof 'diflerent kinds and for other pur poses within the scope of the following claim. Iclaim: V V i A; brake shoecomprising a body, a continu- V ous reenforce back embedded the body throughout its length, and a lug strap, said back having oppositely disposed cut-outs in i its side edges, and said lug strap being'sep arate from the back andhavinglegs engaged" with said cut-outs, the body metal being extended through said cut-outs and alongside 1 said legs, and wings forming part of the m lug strap and projecting inwardly from the 'endsof, said legs, said wings extending lonitudinally of the back and against the inner: iiace thereof and secured rigidly to the back a to reenforce that portion ofthe back where it is reduced in cross-section by the cut-outs. MAURICE N. TRAINER. 

